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yeah, that sort of thing... lots of discussion here:
https://forums.moneysavingexpert.com/discussion/6179196/venting-an-unused-chimney
I'd be surprised if they aren't expecting you to contribute to costs. if they're not - bonus.
another thing to consider is that if you still have chimney breasts in the house, these will need to be ventilated to prevent condensation causing damp once the roof top stack is gone.